Compilare: main.cpp: In member function 'int PersistentSegmTree::update(int, int, int, int)': main.cpp:125:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] int mid = st+dr>>1; ~~^~~ In file included from /usr/include/c++/6/cassert:44:0, from /usr/include/x86_64-linux-gnu/c++/6/bits/stdc++.h:33, from main.cpp:1: main.cpp: In function 'int Query(int, int, int, int, int)': main.cpp:167:30: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(left_nodes.size() == lines); ~~~~~~~~~~~~~~~~~~^~~~ main.cpp:169:31: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] assert(right_nodes.size() == lines); ~~~~~~~~~~~~~~~~~~~^~~~ main.cpp:199:20: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] dr = st+dr>>1; ~~^~~ main.cpp:211:21: warning: suggest parentheses around '+' inside '>>' [-Wparentheses] st = (st+dr>>1)+1; ~~^~~